Pen



FIG. 1 is a front right perspective view of a pen showing my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a right side elevational view thereof, with the left side elevational view being a mirror image of the right side elevational view.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a top plan view thereof.

FIG. 6 is a bottom plan view thereof.

FIG. 7 is an enlarged top plan view thereof; and,

FIG. 8 is an enlarged bottom plan view thereof.

The broken lines in the figures show portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 